php-doc-en/reference/openssl/functions/openssl-get-curve-names.xml

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<refentry xml:id="function.openssl-get-curve-names" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>openssl_get_curve_names</refname>
  <refpurpose>Gets list of available curve names for ECC</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type class="union"><type>array</type><type>false</type></type><methodname>openssl_get_curve_names</methodname>
   <void/>
  </methodsynopsis>
  <para>
   Gets the list of available curve names for use in Elliptic curve 
   cryptography (ECC) for public/private key operations. The two most widely 
   standardized/supported curves are <emphasis>prime256v1</emphasis> 
   (NIST P-256) and <emphasis>secp384r1</emphasis> (NIST P-384).
   <table>
    <title>Approximate Equivalancies of AES, RSA, DSA and ECC Keysizes</title>
    <tgroup cols="3">
     <thead>
      <row>
       <entry>AES Symmetric Keysize (Bits)</entry>
       <entry>RSA and DSA Keysize (Bits)</entry>
       <entry>ECC Keysize (Bits)</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>80</entry>
       <entry>1024</entry>
       <entry>160</entry>
      </row>
      <row>
       <entry>112</entry>
       <entry>2048</entry>
       <entry>224</entry>
      </row>
      <row>
       <entry>128</entry>
       <entry>3072</entry>
       <entry>256</entry>
      </row>
      <row>
       <entry>192</entry>
       <entry>7680</entry>
       <entry>384</entry>
      </row>
      <row>
       <entry>256</entry>
       <entry>15360</entry>
       <entry>512</entry>
      </row>
     </tbody>
    </tgroup>
   </table>
   <link xlink:href="http://dx.doi.org/10.6028/NIST.SP.800-57pt1r4">NIST 
   recommends using ECC curves with at least 256 bits</link>.  
  </para>

 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  &no.function.parameters;
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   An <type>array</type> of available curve names, &return.falseforfailure;.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>openssl_get_curve_names</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
$curve_names = openssl_get_curve_names();
print_r($curve_names);
?>
]]>
    </programlisting>
    &example.outputs.similar;
    <screen>
<![CDATA[
Array
(
    [0] => secp112r1
    [1] => secp112r2
    [2] => secp128r1
    [3] => secp128r2
    [4] => secp160k1
    [5] => secp160r1
    [6] => secp160r2
    [7] => secp192k1
    [8] => secp224k1
    [9] => secp224r1
    [10] => secp256k1
    [11] => secp384r1
    [12] => secp521r1
    [13] => prime192v1
    [14] => prime192v2
    [15] => prime192v3
    [16] => prime239v1
    [17] => prime239v2
    [18] => prime239v3
    [19] => prime256v1
    [20] => sect113r1
    [21] => sect113r2
    [22] => sect131r1
    [23] => sect131r2
    [24] => sect163k1
    [25] => sect163r1
    [26] => sect163r2
    [27] => sect193r1
    [28] => sect193r2
    [29] => sect233k1
    [30] => sect233r1
    [31] => sect239k1
    [32] => sect283k1
    [33] => sect283r1
    [34] => sect409k1
    [35] => sect409r1
    [36] => sect571k1
    [37] => sect571r1
    [38] => c2pnb163v1
    [39] => c2pnb163v2
    [40] => c2pnb163v3
    [41] => c2pnb176v1
    [42] => c2tnb191v1
    [43] => c2tnb191v2
    [44] => c2tnb191v3
    [45] => c2pnb208w1
    [46] => c2tnb239v1
    [47] => c2tnb239v2
    [48] => c2tnb239v3
    [49] => c2pnb272w1
    [50] => c2pnb304w1
    [51] => c2tnb359v1
    [52] => c2pnb368w1
    [53] => c2tnb431r1
    [54] => wap-wsg-idm-ecid-wtls1
    [55] => wap-wsg-idm-ecid-wtls3
    [56] => wap-wsg-idm-ecid-wtls4
    [57] => wap-wsg-idm-ecid-wtls5
    [58] => wap-wsg-idm-ecid-wtls6
    [59] => wap-wsg-idm-ecid-wtls7
    [60] => wap-wsg-idm-ecid-wtls8
    [61] => wap-wsg-idm-ecid-wtls9
    [62] => wap-wsg-idm-ecid-wtls10
    [63] => wap-wsg-idm-ecid-wtls11
    [64] => wap-wsg-idm-ecid-wtls12
    [65] => Oakley-EC2N-3
    [66] => Oakley-EC2N-4
    [67] => brainpoolP160r1
    [68] => brainpoolP160t1
    [69] => brainpoolP192r1
    [70] => brainpoolP192t1
    [71] => brainpoolP224r1
    [72] => brainpoolP224t1
    [73] => brainpoolP256r1
    [74] => brainpoolP256t1
    [75] => brainpoolP320r1
    [76] => brainpoolP320t1
    [77] => brainpoolP384r1
    [78] => brainpoolP384t1
    [79] => brainpoolP512r1
    [80] => brainpoolP512t1
)
]]>
    </screen>
   </example>
  </para>
 </refsect1>

</refentry>
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